Here is information on checking your federal refund status, as well as links to IRS site to determine what their terminology means:
The IRS Where’s My Refund? has a tracker that displays progress through 3 stages: (1) Return Received, (2) Refund Approved and (3) Refund Sent.
https://ttlc.intuit.com/replies/5340655
And here are links for each state:
https://ttlc.intuit.com/replies/3300211
https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
